Started yesterday. Pack up and left the office around 4:30 outside temp around 92. Car acted like it wanted to start but would not. Left it, came back in this morning and it started right up, went back out at lunch and it started right up. Just went out and it won't start. Temp is around 90 with high humidity. Relieved the pressure on the gas tank with no effect. Checked fuses, no bad ones.

Any ideas what is causing this? Car is an 89 190e 2.6.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners